“If our second wind expansion project is approved, one third of our energy in Iowa will be from wind, starting in 2020.”

Alliant Energy received approval in 2016 to add up to 500MW of wind energy and has requested a similar expansion from the Iowa Utilities Board again in 2017.

Apex chief executive and president Mark Goodwin said: “Apex wind projects are designed to meet the needs of forward-thinking utilities such as Alliant Energy. We share the same priorities, especially strong community partnerships.”